Common Fault Lcd Screen - Philips 32PHT4001/60 Service Manual

9. 9. 9. 9. Poor Poor Poor embedded embedded
Poor embedded embedded power
Power on, check embedded power supply 5VSB in TV for 5V voltage output
YES
High electrical level existed at
STB (higher than 2.5V)
YES
Check +5V ， +12V
for normal input
NO
Replace power supply
10. 10. Common Common fault fault fault of of of of LCD
10. 10. Common Common fault
10.1 Bright line or bright belt (BL): constant longitudinal or transverse illuminating line or
belt due to non-conformed connection between IC and glass
10.2 Dark line (DL): constant longitudinal or transverse illuminating line due to
non-conformed connection between IC and glass.
10.3 White panel (WP): only light tube illuminates owing to non-conformed drive plate of
the LCD, without any display signal in the display area, and the whole screen is white.
10.4 Screen breaking: (overflow of LCD): with damage or invisible damage of the liquid
crystal glass, irregular black defect occurs from liquid crystal body to glass and polarizer,
which can not be seen at any image. The overflow portion can not form image and does not
display.
10.5 Pressing Scrape (PS): after local display area at the front of LCD is heavily pressed,
power power supply supply supply of of of of TV TV TV
power supply TV
NO
Check EC2 for 380-400V
voltage; if there is not,
replace power supply
LCD LCD screen screen
LCD screen screen
Check power supply line for looseness, check indictor for
working and power supply socket for looseness
YES
Fasten
and socket
20
NO
lines Replace power
supply
NO